MAV AquaDoc Total Alkalinity Increaser for Hot Tubs & Spas — 2 lb (2-Pack), Fast-Dissolving Sodium Bicarbonate

MAV AquaDoc Total Alkalinity Increaser for Hot Tubs & Spas is a two-pack of fast-dissolving sodium bicarbonate granules formulated to raise and stabilize total alkalinity for more consistent spa water chemistry.

Keeping a hot tub’s total alkalinity within the proper range prevents rapid pH swings and makes routine water care simpler. This 2 lb two-pack provides an easy-to-measure solution to lift low alkalinity, support pH buffering, and reduce the frequency of corrective dosing. Designed for use in spas and hot tubs, the granules dissolve quickly when added to circulating water, helping you restore balance without extended downtime.

How do I use this alkalinity increaser safely and effectively?

Test total alkalinity first, then add the product gradually to avoid overshooting the target range. Broadcast the recommended amount around the perimeter of the running spa, allow circulation for one to two hours, and retest before making further adjustments.

• Measure SPA volume and current alkalinity (target 80–140 ppm).
• Start with the manufacturer’s dose, dissolve directly in circulating water if instructed.
• Circulate for 1–2 hours, then retest and repeat as needed in small increments.

What benefits will I notice after raising alkalinity?

Raising total alkalinity creates a buffering capacity that helps prevent sudden pH changes, reducing the need for frequent corrections. Water feels more comfortable, and sanitizer performance becomes more stable when pH remains steady.

• Less pH bounce and fewer corrective adjustments.
• Smoother-feeling water and clearer chemical balance.
• Improved predictability of sanitizer behavior and maintenance chores.

Is this product compatible with my hot tub chemicals and surfaces?

The active ingredient, sodium bicarbonate, is a common, spa-safe alkalinity increaser compatible with most sanitizers and hot tub materials when used as directed. Avoid combining with acids directly; always add this product separately and allow circulation before treating with other chemicals.

• Works alongside chlorine or bromine sanitizers when dosed correctly.
• Safe for acrylic, fiberglass, and common hot tub finishes with proper dosing.
• Do not mix with acids or undissolved chemicals in tight spaces.

How quickly will I see results after adding the granules?

Because the granules are formulated to dissolve rapidly, measurable changes in total alkalinity are typically visible after one to two hours of circulation. Always retest before adjusting further to avoid overshooting the recommended alkalinity range.

• Fast-dissolving formula reduces wait time before retesting.
• Most users see stabilized readings after a single dosing and circulation period.
• If levels remain low, repeat add-and-test cycles in small increments.

Who is this for: MAV AquaDoc Total Alkalinity Increaser is intended for hot tub and spa owners who want a straightforward, U.S.-made product to correct low alkalinity and improve overall water stability. It's a practical choice for homeowners, property managers, and light-maintenance professionals seeking predictable, fast-acting alkalinity adjustments without complicated application steps.